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html 代码
<head>
<meta charset=”UTF-8″>
<title></title>
<style>
/*三角形*/
.triangle {
width: 0;
height: 0;
border: 10px solid transparent;
border-top-color: #40BBF4;
}
/*提示框*/
.msg {
position: relative;
width: 200px;
height: 100px;
border: 1px solid #ccc;
box-shadow: 0 0 10px 2px #ccc;
}
.msg .triangle {
position: absolute;
top: 100%;
left: calc((100% – 10px) / 2);
width: 0;
height: 0;
border: 10px solid transparent;
border-top-color: #ccc;
}
.msg .triangle:after {
content: “”;
position: absolute;
top: -11px;
left: -9px;
width: 0;
height: 0;
border: 9px solid transparent;
border-top-color: white;
}
</style>
</head>
<body>
<!–三角形–>
<div class=”triangle”></div>
<!–提示框–>
<div class=”msg”>
<div class=”triangle”></div>
</div>
</body>
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